It's interesting because this could be seen from two perspectives, both of which are equally invalid.

On the one hand, you have the inability of BU to keep their website active through attempted DDoS attacks, but this is invalid because really good hackers (which people working with Bitcoin often can be) can surely get past very good protection.

On the other hand you could argue that it shows hostility of some SegWit supporters, but this is invalid because it doesn't represent them as a whole.

So generally, neither argument about this is actually valid and it shouldn't matter except for the fact that you won't be able to see it anymore.